Fujitsu has announced new technology that can find and verify risks in blockchain applications. The tech analyses smart contracts to find potential flaws, providing advance warning of vulnerabilities. The company has identified six main risks.

Flaws in smart contracts could allow attackers to steal millions of dollars in Ethereum, according to security researchers. Over 34,000 smart contracts are affected by vulnerabilities that could let anyone acquire the contents of cryptocurrency wallets.

In 2014 bitcoin rose in value to be worth several hundred dollars after being worth virtually nothing at its launch in 2009 and for some time afterward. At around the same time or earlier other cryptocurrencies were issued for various purposes.

The cryptocurrency Ripple has more than doubled in price this week and is now the fourth largest by market cap. Ripple has overtaken Litecoin, another alternative coin with similar gains over the past week. Bitcoin's rally is driving the trend.

Internxt, a new peer-to-peer cloud provider, has announced an initial coin offering (ICO) to fund its attempt to build a decentralised Internet. The company wants to solve technical roadblocks to reaching web decentralisation, offering more privacy.